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How To Downgrade iPhone 3.1 Baseband From 05.11.07 to 04.26.08

Though it’s warned by the iPhone Dev Team not to upgrade your iPhone OS directly via iTunes. I’ve got quite a number of emails from iPhone jailbreakers telling that:

Oh! I accidentally upgraded my iPhone 3G to firmware 3.1 by iTunes. After upgrade, I lost the jailbreak and the unlock. Now, I can’t make call with my iPhone. Even I jailbreak it again, it still doesn’t work and with no service. Any solution?

Probably you’re facing the same problem. As you may not know, the iPhone OS 3.1 also comes with a baseband update to 05.11.07 for iPhone 3G. However, the Ultrasn0w (i.e. the iPhone unlock tool) cannot unlock this version of baseband. It can only handle the lower baseband version 04.26.08. That is the reason why we emphasize not to upgrade to iPhone 3.1 via iTunes directly, particular you need to use ultrasn0w for unlocking.

Fortunately, there is a solution for that, though not for all iPhones. Thanks for the developers of Fuzzyband Downgrader. Fuzzyband is a tool that allows you to downgrade the baseband from 05.11.07 to 04.28.06. By downgrading the baseband, you can use ultrasn0w to unlock your iPhone again.
Cool, right? There is a catch, however. Fuzzyband can only support iPhone with bootloader 05.08 (5.8) from the factory. Only a limited number of iPhones that were released in the first few weeks of the iPhone 3G production cycle were loaded with the bootloader version. For other bootloader versions, I regret that you need to wait for iPhone Dev team to release the unlock solution. Not sure your bootloader version? Fuzzyband will take care that for you and verify if your iPhone is using the valid bootloader version.

accidently upgraded to 3.1 now wanted to downgrade it to 3.0 but getting an error 1015 towards the end (about 70%) of restoring the firmware 3.0 . I tried it with itune 8.2 and again with itune 9. same result so I restored back to 3.1 now waiting …….. for news

When you have the error 1015 close the itunes and open the QUICKPWN –> http://www.megaupload.com/?d=H4BLU49J (download link), and follow the instruction that appears in message (Power button + Home button (15s), Release the home button and wait 2s power button) you will see the apple logo
(this is for windows)

But if you have the baseband 05.11.07 this don’t downgrade the baseband to 4.6!

@Urbanz, there is no way to downgrade baseband for bootloader 5.9 for now. Please be patient and wait for iPhone Dev team to release an unlock solution.

mikey

Thanxs buddy for helping me out with ‘the 1015 error’ solution now I m wainting for the unlock just like u guys…….. let me know when the unlock solution comes up. Cheers

Liang Zhou

OMG!!! I am having the same problem, but because my bootloader is 5.9…on 3G firmwire 3.0… this is scary because I do not understand why Apple have to release such phone out when they do not have the full responsibility on the phone…this is really crazy. How can you buy the phone and still not be able to use it due to crazy updates you do….I’m really pissed OFF…

I was woundering if I can downgrade my firmware? Because my bootloader version is 06.04 and is there some way to to it right now? And fuzzyband says “NOT SUPPORTED” for that. it says only working for bootloader 05.08

???? HELP ????

UrbanZ

Yes you can downgrade your firmware, but you can’t downgrade baseband, you need bootloader v. 5.8 to do this process =S

Hi
I install that but when open it show not supported.
” this software cannot be used on iphone os 3.0 ; you must downgrade to 2.2.1 or lower.”
If I downgrade can I change my basebond? from 5.11.7 to lower!
because I dont have antena!!!

Sam

Baseband 5.11.7 can be downgraded using Fuzzyband tool only if bootloader version is 5.8 or below of your Iphone, if it is 5.9, fuzzyband can not downgrade baseband of your iPhone. You have to find another way, I am also looking for one. Please let me know too if you find one. Thanks!

UrbanZ

Download fuzzyband, not the “3g fuzzyband downgrade”

Good luck

amin

So thanks sir
I do that but my bootloader is 5.9
Can I change my boot loader?

UrbanZ#

Sorry, but you can change bootloader the difference between 5.8 and 5.9 is not only software, have hardware to.
I’m in the same situation, wait for dev team solution 🙁

UrbanZ#

Good news guys and girls, geohot is working in a solution to unlock baseband 05.11

Hi
I have iphone 3gs on that i have 3.1.2 firmware with a baseband 05.11.07 now i am able to unlock my iphone so i need help plz tell me if any baseband downgrade option or unlock option for iphone 3gs…….thnx in advance

Paramveer Bhatia

Hi
I have iphone 3gs on that i have 3.1.2 firmware with a baseband 05.11.07 now i am not able to unlock my iphone so i need help plz tell me if any baseband downgrade option or unlock option for iphone 3gs…….thnx in advance

@Paramveer, for the time being, there is no solution to unlock that version of baseband.

UrbanZ

Exactly for now no solution, but geohot and the rest of the team is working to find a new exploit to unlock this baseband.

krasimir

Hi Simon,
I read everything, but still i’ll ask what i can do with iphone 3G 3.0 (i don’t know the history of this phone) after i restore it and giving me error 1015, then i actived and jailbreak it with redsn0w 8, i try fuzzyband downgrader but i get message “not supported” :Bootloader Version 05.09 and baseband version 05.11.07
so do i have to wait for new software or there is some solution

stephanie

its telling me downgrading will only work with baseband bootloader 05.08??? please help being trying to unlock this thing for months!!! arghhhh!!!!

Geohot is releasing an unlock for iPhone Baseband Version 05.11.07 on 3/11/2009.
Does this mean if I have Bootloader Version 5.9 with 05.11.07 I will be able to downgrade my boot loader to version 4.6 if I wanted to change the IMEI?

GeoHot has released a new jailbreak and unlock tool to handle the latest version of baseband. You do not need to tackle with the downgrade anymore. Just check out this jailbreak guide and unlock your iPhone with blacksn0w.

Tomer

Note that this is also a great tool for upgrading your baseband to a desired firmware (assuming you used a custom firmware thus preserving an old FW (2.28.00, for example) that doesn’t work with ultrasn0w)

helped me a lot

Sadboy

Hello Simon. I am the lucky guy who didn’t update his phone via iTunes this time. I am having 3.0 in my iPhone. Can you please help me how to get bitesms application in my iPhone. Previously it was free but now they are charging. Problem is that don’t have credit card here in Pakistan, so please help me how to get bitesms. I’ll be very thankfull to you. Regards

hey guys ive got a 3.1.3 bl 6.4 needing to change the imie as its been reported lost by the previous owner and yes it was lost 😀 i know cause i found it…. anywys im askin anyone that doesnt mind helpin someone thats not exactly honest… i refuse to give it back for one reason alone.. its worth a heap and well.. I FKN FOUND IT :/! aaanyways.. if anyone knnows hot to either downgrade the BL or change the imie without to much hassle or hardware variations pls email me at [email protected]